Practice Test: Question Set - 18
1. Blast furnace coke is made from coal by
- (A) Low temperature carbonization
- (B) High temperature carbonization
- (C) Medium temperature carbonization
- (D) Heating the coal in an oven in presence of air
2. Which of the following petrographic constituents of coal is non-coking?
- (A) Vitrain
- (B) Clarain
- (C) Durain
- (D) Fussain
3. In flue gas analysis by Orsat's apparatus, oxygen is absorbed by
- (A) Potassium hydroxide
- (B) Cuprous chloride
- (C) Alkaline pyrogallol solution
- (D) None of these
4. Power alcohol as compared to straight run gasoline has lower
- (A) Calorific value
- (B) Octane number
- (C) Specific gravity
- (D) Viscosity
5. Dry air requirement for burning 1 Nm3 of CO to CO2 may be around __________ Nm3.
- (A) 2.4
- (B) 1.75
- (C) 0.87
- (D) 11.4
6. Abrasion index of blast furnace coke should be around __________ percent.
- (A) 20
- (B) 35
- (C) 55
- (D) 80
7. Naphthalene is used for making
- (A) Insecticides (e.g. moth balls)
- (B) Unsaturated polyesters
- (C) Drug intermediates e.g. β-naphthol
- (D) All (a), (b) and (c)
8. Pick out the wrong statement.
- (A) Main constituents of LPG are propane and butane
- (B) C.V. of natural gas is about 10000 KCal/Nm3
- (C) C.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg)
- (D) L.P.G. is lighter than air
9. Which of the following accounts for maximum energy loss in a boiler?
- (A) Flue gases
- (B) Ash content in the fuel
- (C) Incomplete combustion
- (D) Unburnt carbon in flue gases
10. The calorific value of L.D. converter gas is about __________ Kcal/Nm3.
- (A) 1800
- (B) 800
- (C) 4500
- (D) 10000
11. Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
- (A) 5
- (B) 25
- (C) 55
- (D) 75
12. Which of the following has the highest heat of combustion?
- (A) H2
- (B) CO
- (C) CH4
- (D) C2H6
13. Anthracite can be used for
- (A) Recarbonising steel
- (B) Making carbon electrodes
- (C) Blending with highly coking coal to check its swelling which helps
in saving coke even walls from damage and to produce high strength coke
- (D) All (a), (b) and (c)
14. Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.
- (A) 3-5
- (B) 25-30
- (C) 60-65
- (D) 95-100
15. Pick out the wrong statement.
- (A) Indian coals on an average contain 25-30% ash as
against 10-12% ash in imported coking coal
- (B) Ammonia is recovered in the form of ammonium sulphate in direct
process of by-product recovery
- (C) A high swelling index number of coking coal indicates poor caking
properties of coal
- (D) Wash oil is used for scrubbing Benzol from coke oven gas
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